Transmission will not shift

Asked by Aug 15, 2015 at 05:43 AM about the 1993 GMC Sierra 1500 C1500 SLE Standard Cab SB

Question type: Maintenance & Repair

Have to manually shift from 1st to 2nd then
drive overdrive works have the time

3 Answers

94,105

There are many components in a modern transmission and all need to work in harmony, below is a web site that can you you more insight on how a transmission works. Your car needs to go to a transmission shop to be tested, I'm sure its something simple. http://www.mistertransmission.com/transmission -components

1 out of 1 people think this is helpful.
94,105

Make sure your fluid lever is ok...

My 96 s10 Blazer did the exact same thing. I got it checked out and it had 2 transmission codes pop up. One was P1860 (TCC PWM Solenoid Circuit Electrical) and the other was p1870 (Transmission Component Slipping). I replaced the torque converter, inner and outer wire harnesses, and the valve body. It shifts perfect now.

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